275
FXUS66 KSGX 280919
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
219 AM PDT SAT MAR 28 2026
SYNOPSIS
WELL ABOVE AVERAGE TEMPERATURES WILL CONTINUE THROUGH THE WEEKEND.
PATCHY LOW CLOUDS CONTINUE TO DEVELOP EARLY THIS MORNING, CLEARING
BY MID-MORNING AND LESS LIKELY TO RETURN THROUGH EARLY NEXT WEEK
DUE TO WIDESPREAD HIGH CLOUD COVERAGE. COOLER AND BREEZIER
CONDITIONS ARE LIKELY BY THE MIDDLE OF NEXT WEEK, ALTHOUGH
PRECIPIATION CHANCES CONTINUE TO DECREASE.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SATELLITE DEPICTS LOW CLOUDS SLOWLY FILLING INTO THE COASTAL PLAIN
OF ORANGE COUNTY AND STRUGGLING TO DEVELOP IN SAN DIEGO COUNTY.
PATCHY LOW CLOUDS SHOULD EVENTUALLY DEVELOP UP TO THE I-15 CORRIDOR
BEFORE SUNRISE, YIELDING TO PATCHY FOG ON THE COASTAL MESAS AND
WESTERN VALLEYS. THESE LOW CLOUDS ARE EXPECTED TO COMPLETELY SCATTER
OUT BY MID MORNING.
DAILY HIGH AND LOW TEMPERATURE RECORDS CONTINUE TO BREAK (LISTED ON
OUR WEATHER.GOV/SANDIEGO HOMEPAGE) AND ARE EXPECTED TO CONTINUE TO
BREAK THROUGH SUNDAY, ESPECIALLY IN THE MOUNTAINS AND DESERTS. THE
RIDGE IS EXPECTED TO HAVE A PEAK 500 MB HEIGHT AROUND 590 DAM THIS
AFTERNOON, CENTERED OVER WEST TEXAS, YIELDING ANOTHER DAY OF
TEMPERATURE ANOMALIES OF 15-25 DEGREES ABOVE AVERAGE. ONSHORE FLOW
WILL LIMIT THOSE ANOMALIES ALONG THE COAST WITH HIGHS REMAINING IN
THE 70S WHERE THE SEA BREEZE KICKS UP IN THE LATE MORNING. THE
MARINE LAYER WILL BE VERY SHALLOW SATURDAY NIGHT AND CLOUDS/FOG WILL
BE ALMOST NON-EXISTANT (EVEN OVER THE WATERS), YIELDING TO ANOTHER
MILD NIGHT ACROSS THE REGION. LOWS WILL STRUGGLE TO DROP UP BELOW
THE MID-60S IN THE MOUNTAIN FOOTHILLS AND NORTH OF THE SR-210
CORRIDOR. WHILE HIGH TEMPERATURES SUNDAY WILL BE VERY SIMILAR TO
TODAY'S HIGHS, THE BROAD RIDGE OVER TEXAS IS EXPECTED TO WEAKEN AND
SLIDE EASTWARD, ALLOWING FOR THE MARINE LAYER TO DEEPEN AND BRING
NOTICEABLY COOLER NIGHTTIME TEMPERATURES IN THE 50S ACROSS THE
COASTAL BASIN. BY MONDAY, HIGHS DROP NOTICEABLY INLAND - ABOUT 6 TO
10 DEGREES - AS UPPER LEVEL FLOW OVER THE WESTERN US TURNS MORE
ZONAL. A RELATIVELY SHALLOW TROUGH IS THEN EXPECTED TO DIG INTO THE
PACIFIC NORTHWEST MID-WEEK, WEAKENING SIGNIFICANTLY AS IT MAKES IT
SOUTHWARD TREK, THOUGH SETTING THE STAGE FOR COOLER, CLOUDIER AND
BREEZIER CONDITIONS FOR MID-WEEK.
PRECIPITATION CHANCES CONTINUE TO DWINDLE, HOWEVER, FOR SOUTHERN
CALIFORNIA AS THE MAJORITY OF MODEL ENSEMBLE RUNS REMAIN
COMPLETELY DRY, AND THE REMAINING OTHERS SHOWING NO MORE THAN A
TRACE FOR THE ENTIRE COASTAL BASIN. THE WINDOW FOR ANY LIGHT
SHOWERS APPEARS TO BE FOCUSED ON EARLY WEDNESDAY, WITH THE HIGHEST
CHANCES (15-25%) IN THE MOUNTAINS, WHERE GUIDANCE SHOWS
INCREASING CONFIDENCE FOR NO MORE THAN 0.10" TOTAL. CONFIDENCE IS
MUCH HIGHER THAT TEMPERATURES RETURN CLOSE TO AVERAGE WEDNESDAY
AND THURSDAY.
AVIATION
280000Z...LOW CLOUDS WILL RETURN BY LATER THIS EVENING AROUND 06Z-
07Z SATURDAY. BASES WILL BE SLIGHTLY LOWER AND PATCHY IN NATURE WITH
INTERMITTENT HEIGHTS AROUND 100-700FT MSL AND REDUCED VIS 0-5SM.
LOWER VISIBILITIES WILL BE LOCATED ON HIGHER COASTAL TERRAIN, WITH
THE HIGHEST PROBABILITY OF OCCURRENCE AT AND IN VICINITY OF KCRQ.
LOW CLOUDS AND VISIBILITIES WILL BEGIN CLEARING INLAND TO THE COAST
AFTER 16Z-18Z SATURDAY. LOW CLOUDS WILL LIKELY STRUGGLE TO FORM AND
RETURN TO THE COASTAL AREAS BY 06Z SUNDAY, WITH THE INCREASE AND
PASSAGE OF MID TO HIGH LEVEL CLOUDS TOMORROW EVENING.
OTHERWISE, MOSTLY CLEAR SKIES AND VFR CONDITIONS THROUGH THE TAF
PERIOD.
MARINE
NO HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH
WEDNESDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...WESTERINK
AVIATION/MARINE...WESTERINK
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